The Big Bang Theory

Season 9

TV-PG

67%75%

Our two genius roommates, Leonard and Sheldon, and their friends are back once again (smarter, but no wiser). Last season, Sheldon went soul-searching (on a train, of course) and was prepared to make some substantial revisions on his Relationship Agreement with Amy, when everything changed. Leonard, meanwhile, was off to Vegas with Penny to finally tie the knot in the season finale. Howard finds himself alone with Bernadette after the sudden passing of his mother; while Raj is not only talking to women – he’s getting exclusive with Emily. Together, they will all learn that life is far more complicated outside of the lab as love and friendship never produce predictable results!

Where to Watch Season 9

24 Episodes

The Matrimonial Momentum
E1
The Matrimonial MomentumPenny struggles with Leonard's confession that he kissed another woman as they prepare to get married in Las Vegas. Meanwhile, Sheldon doesn't know what to do after Amy pushes pause on their relationship.
The Separation Oscillation
E2
The Separation OscillationLeonard confronts the woman he kissed on the North Sea in an attempt to set Penny's mind at ease. Also, Sheldon films a special episode of "Fun with Flags" after his breakup with Amy, and Bernadette feels guilty about withholding a secret from Penny.
The Bachelor Party Corrosion
E3
The Bachelor Party CorrosionThe guys' science skills are put to the test when they get a flat tire during Leonard's bachelor party weekend in Mexico. Also, the girls force Penny to finally tell her family that she eloped with Leonard.
The 2003 Approximation
E4
The 2003 ApproximationSheldon learns of an impending change in his living arrangements and decides to revert back to 2003, a simpler time before he met Leonard and Penny. Also, Howard and Raj form a band to play at the Comic Book Store.
The Perspiration Implementation
E5
The Perspiration ImplementationThe guys take a fencing lesson from Barry Kripke and Sheldon finds himself in an awkward position when Kripke expresses interest in Amy. Also, when Stuart struggles to get female customers at the Comic Book Store, Penny, Amy and Bernadette come by to help him out.
The Helium Insufficiency
E6
The Helium InsufficiencyIn the midst of a nation-wide helium shortage, Sheldon and Leonard take desperate measures to get the supplies they need. Also, Penny and Bernadette download a dating app on Amy's phone to try and find her a new man.
The Spock Resonance
E7
The Spock ResonanceWil Wheaton interviews Sheldon for a Star Trek documentary where he reveals the ring and his plan to propose to Amy. Bernadette wants to start renovating the house and the topic of starting a family together with Howard is brought up.
The Mystery Date Observation
E8
The Mystery Date ObservationSheldon, Wolowitz and Koothrappali post an online advertisement to find Sheldon a new girlfriend. Also, when Amy is coy with details about a guy she is dating, Penny and Bernadette decide to spy on her.
The Platonic Permutation
E9
The Platonic PermutationSheldon and Amy try hanging out as friends when they spend Thanksgiving together at the aquarium. Also, Wolowitz reluctantly agrees to volunteer at the soup kitchen with Bernadette, Raj and Emily, and Penny discovers that Leonard knows more about her than she thought.
The Earworm Reverberation
E10
The Earworm ReverberationSheldon has a revelation when he realizes why a song was stuck in his head. Also, Amy invites Dave over for dinner despite their previously awkward date, and Wolowitz and Koothrappali become obsessed with a fan of their band, "Footprints on the Moon".
The Opening Night Excitation
E11
The Opening Night ExcitationProfessor Proton visits Sheldon in a dream and gives him advice about whether to go see the new Star wars film or spend the time with his newly reunited girlfriend Amy on her birthday. Meanwhile, Leonard, Howard and Raj try to decide who will get their extra ticket to the movie premiere.
The Sales Call Sublimation
E12
The Sales Call SublimationPenny gets more than she bargained for when Leonard agrees to meet with a psychiatrist on her behalf. Also, Sheldon and Koothrappali collaborate on an astronomical discovery, and Wolowitz and Bernadette can't believe what they are feeling after Stuart moves out.
The Empathy Optimization
E13
The Empathy OptimizationAfter having to deal with a sick Sheldon, Leonard, Penny and the gang try to treat themselves to a Sheldon-free weekend.
The Meemaw Materialization
E14
The Meemaw MaterializationSheldon is thrilled when his Meemaw comes to visit, but his excitement quickly fades when she butts heads with Amy. Meanwhile, Raj meets a girl at the comic book store who makes him question his relationship with Emily.
The Valentino Submergence
E15
The Valentino SubmergenceSheldon and Amy host a live Valentine's Day episode of Fun with Flags, Leonard and Penny grapple with getting older, Howard and Bernadette find a surprise in their hot tub and Raj is torn between Emily and the cute girl he met at the Comic Bookstore.
The Positive Negative Reaction
E16
The Positive Negative ReactionWhen the gang finds out about Bernadette’s pregnancy, they celebrate by singing karaoke. Also, Bernadette is concerned when Wolowitz freaks out over her pregnancy announcement, and Wolowitz is convinced he must make more money to provide for the baby.
The Celebration Experimentation
E17
The Celebration ExperimentationAfter more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.
The Application Deterioration
E18
The Application DeteriorationLeonard, Sheldon, and Wolowitz run into problems when they file for a patent for their infinite persistence gyroscope. Also, Penny, Amy and Bernadette give Koothrappali dating advice when Emily reaches out to him after their breakup.
The Solder Excursion Diversion
E19
The Solder Excursion DiversionAmy is shocked at a revelation from Sheldon after she buys him a new laptop. Also, Koothrappali sells out Leonard and Wolowitz after they lie to their wives in order to attend an early screening of a movie.
The Big Bear Precipitation
E20
The Big Bear PrecipitationSheldon spills a secret of Leonard’s when the two take a weekend cabin trip with Penny and Amy. Also, when Koothrappali goes overboard with pregnancy gifts, Wolowitz and Bernadette must draw the line.
The Viewing Party Combustion
E21
The Viewing Party CombustionEveryone must choose sides when a small argument between Leonard and Sheldon erupts into a heated fight during a group get-together.
The Fermentation Bifurcation
E22
The Fermentation BifurcationThe gang goes to a wine bar and runs into Penny’s old boyfriend, Zack. Also, Bernadette gets stuck spending the evening with Sheldon when she can’t go wine tasting with the group, and things don’t go as planned when Koothrappali introduces his new girlfriend, Claire.
The Line Substitution Solution
E23
The Line Substitution SolutionSheldon hires Stuart to spend the day with Amy when he’d rather go to a movie screening. Also, Leonard’s mother, Beverly, comes to town and Penny struggles to make a connection with her.
The Convergence Convergence
E24
The Convergence ConvergenceChaos ensues when Leonard’s recently divorced parents, Alfred and Beverly, and Sheldon’s devoutly religious mother, Mary, come to town. Also, Wolowitz and Koothrappali think the government is out to get them when they are contacted about their guidance system.